Dolphin Capital Investors, a real estate investment company focusing on the residential resort sector in emerging markets, and listed on the Alternative Investment Market (AIM) of the London Stock Exchange

Douglas Constructions Inc., an Australian construction company working exclusively in the Minecraft realm

DCI (Wizards of the Coast) (formerly known as Duelists' Convocation International), the organization that sanctions official tournaments of Wizards of the Coast games, most notably Magic: The Gathering

DCI Global Partnerships, the community and work associated with DCI Trust—a UK charity committed to mobilising Christian leaders, providing micro-loans for the economically poor, networking a global Christian constituency and giving to bless the poor of the earth

Defence Capabilities Initiative, a 1999 NATO plan to ensure the effectiveness of future multinational operations in the present and foreseeable security environment with a special focus on improving interoperability among Alliance forces